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SubjectRe: [PATCH 2/2] rtc: st-lpc: add range
Hi Alexandre,

I love your patch! Yet something to improve:

[auto build test ERROR on abelloni/rtc-next]
[also build test ERROR on v4.17-rc6 next-20180517]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/Alexandre-Belloni/rtc-st-lpc-fix-possible-race-condition/20180521-192317
base: https://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux.git rtc-next
config: arm-multi_v7_defconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
make.cross ARCH=arm

All error/warnings (new ones prefixed by >>):

drivers/rtc/rtc-st-lpc.c: In function 'st_rtc_probe':
>> drivers/rtc/rtc-st-lpc.c:261:5: error: 'struct st_rtc' has no member named 'range_max'
rtc->range_max = do_div(U64_MAX, rtc->clkrate);
^~
In file included from arch/arm/include/asm/div64.h:127:0,
from include/linux/kernel.h:173,
from include/linux/clk.h:16,
from drivers/rtc/rtc-st-lpc.c:17:
>> include/asm-generic/div64.h:226:7: error: lvalue required as left operand of assignment
(n) >>= ilog2(__base); \
^
>> drivers/rtc/rtc-st-lpc.c:261:19: note: in expansion of macro 'do_div'
rtc->range_max = do_div(U64_MAX, rtc->clkrate);
^~~~~~
>> include/asm-generic/div64.h:230:31: warning: large integer implicitly truncated to unsigned type [-Woverflow]
uint32_t __res_lo, __n_lo = (n); \
^
>> drivers/rtc/rtc-st-lpc.c:261:19: note: in expansion of macro 'do_div'
rtc->range_max = do_div(U64_MAX, rtc->clkrate);
^~~~~~
include/asm-generic/div64.h:231:7: error: lvalue required as left operand of assignment
(n) = __div64_const32(n, __base); \
^
>> drivers/rtc/rtc-st-lpc.c:261:19: note: in expansion of macro 'do_div'
rtc->range_max = do_div(U64_MAX, rtc->clkrate);
^~~~~~
include/asm-generic/div64.h:233:14: warning: large integer implicitly truncated to unsigned type [-Woverflow]
__res_lo = (n); \
^
>> drivers/rtc/rtc-st-lpc.c:261:19: note: in expansion of macro 'do_div'
rtc->range_max = do_div(U64_MAX, rtc->clkrate);
^~~~~~
include/asm-generic/div64.h:237:7: error: lvalue required as left operand of assignment
(n) = (uint32_t)(n) / __base; \
^
>> drivers/rtc/rtc-st-lpc.c:261:19: note: in expansion of macro 'do_div'
rtc->range_max = do_div(U64_MAX, rtc->clkrate);
^~~~~~
>> include/asm-generic/div64.h:239:22: error: lvalue required as unary '&' operand
__rem = __div64_32(&(n), __base); \
^
>> drivers/rtc/rtc-st-lpc.c:261:19: note: in expansion of macro 'do_div'
rtc->range_max = do_div(U64_MAX, rtc->clkrate);
^~~~~~
--
drivers//rtc/rtc-st-lpc.c: In function 'st_rtc_probe':
drivers//rtc/rtc-st-lpc.c:261:5: error: 'struct st_rtc' has no member named 'range_max'
rtc->range_max = do_div(U64_MAX, rtc->clkrate);
^~
In file included from arch/arm/include/asm/div64.h:127:0,
from include/linux/kernel.h:173,
from include/linux/clk.h:16,
from drivers//rtc/rtc-st-lpc.c:17:
>> include/asm-generic/div64.h:226:7: error: lvalue required as left operand of assignment
(n) >>= ilog2(__base); \
^
drivers//rtc/rtc-st-lpc.c:261:19: note: in expansion of macro 'do_div'
rtc->range_max = do_div(U64_MAX, rtc->clkrate);
^~~~~~
>> include/asm-generic/div64.h:230:31: warning: large integer implicitly truncated to unsigned type [-Woverflow]
uint32_t __res_lo, __n_lo = (n); \
^
drivers//rtc/rtc-st-lpc.c:261:19: note: in expansion of macro 'do_div'
rtc->range_max = do_div(U64_MAX, rtc->clkrate);
^~~~~~
include/asm-generic/div64.h:231:7: error: lvalue required as left operand of assignment
(n) = __div64_const32(n, __base); \
^
drivers//rtc/rtc-st-lpc.c:261:19: note: in expansion of macro 'do_div'
rtc->range_max = do_div(U64_MAX, rtc->clkrate);
^~~~~~
include/asm-generic/div64.h:233:14: warning: large integer implicitly truncated to unsigned type [-Woverflow]
__res_lo = (n); \
^
drivers//rtc/rtc-st-lpc.c:261:19: note: in expansion of macro 'do_div'
rtc->range_max = do_div(U64_MAX, rtc->clkrate);
^~~~~~
include/asm-generic/div64.h:237:7: error: lvalue required as left operand of assignment
(n) = (uint32_t)(n) / __base; \
^
drivers//rtc/rtc-st-lpc.c:261:19: note: in expansion of macro 'do_div'
rtc->range_max = do_div(U64_MAX, rtc->clkrate);
^~~~~~
>> include/asm-generic/div64.h:239:22: error: lvalue required as unary '&' operand
__rem = __div64_32(&(n), __base); \
^
drivers//rtc/rtc-st-lpc.c:261:19: note: in expansion of macro 'do_div'
rtc->range_max = do_div(U64_MAX, rtc->clkrate);
^~~~~~

vim +261 drivers/rtc/rtc-st-lpc.c

192
193 static int st_rtc_probe(struct platform_device *pdev)
194 {
195 struct device_node *np = pdev->dev.of_node;
196 struct st_rtc *rtc;
197 struct resource *res;
198 uint32_t mode;
199 int ret = 0;
200
201 ret = of_property_read_u32(np, "st,lpc-mode", &mode);
202 if (ret) {
203 dev_err(&pdev->dev, "An LPC mode must be provided\n");
204 return -EINVAL;
205 }
206
207 /* LPC can either run as a Clocksource or in RTC or WDT mode */
208 if (mode != ST_LPC_MODE_RTC)
209 return -ENODEV;
210
211 rtc = devm_kzalloc(&pdev->dev, sizeof(struct st_rtc), GFP_KERNEL);
212 if (!rtc)
213 return -ENOMEM;
214
215 rtc->rtc_dev = devm_rtc_allocate_device(&pdev->dev);
216 if (IS_ERR(rtc->rtc_dev))
217 return PTR_ERR(rtc->rtc_dev);
218
219 spin_lock_init(&rtc->lock);
220
221 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
222 rtc->ioaddr = devm_ioremap_resource(&pdev->dev, res);
223 if (IS_ERR(rtc->ioaddr))
224 return PTR_ERR(rtc->ioaddr);
225
226 rtc->irq = irq_of_parse_and_map(np, 0);
227 if (!rtc->irq) {
228 dev_err(&pdev->dev, "IRQ missing or invalid\n");
229 return -EINVAL;
230 }
231
232 ret = devm_request_irq(&pdev->dev, rtc->irq, st_rtc_handler, 0,
233 pdev->name, rtc);
234 if (ret) {
235 dev_err(&pdev->dev, "Failed to request irq %i\n", rtc->irq);
236 return ret;
237 }
238
239 enable_irq_wake(rtc->irq);
240 disable_irq(rtc->irq);
241
242 rtc->clk = clk_get(&pdev->dev, NULL);
243 if (IS_ERR(rtc->clk)) {
244 dev_err(&pdev->dev, "Unable to request clock\n");
245 return PTR_ERR(rtc->clk);
246 }
247
248 clk_prepare_enable(rtc->clk);
249
250 rtc->clkrate = clk_get_rate(rtc->clk);
251 if (!rtc->clkrate) {
252 dev_err(&pdev->dev, "Unable to fetch clock rate\n");
253 return -EINVAL;
254 }
255
256 device_set_wakeup_capable(&pdev->dev, 1);
257
258 platform_set_drvdata(pdev, rtc);
259
260 rtc->rtc_dev->ops = &st_rtc_ops;
> 261 rtc->range_max = do_div(U64_MAX, rtc->clkrate);
262
263 ret = rtc_register_device(rtc->rtc_dev);
264 if (ret) {
265 clk_disable_unprepare(rtc->clk);
266 return ret;
267 }
268
269 return 0;
270 }
271

---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
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